Its been a couple years not working on BMW's....but in similar situations ive seen clogged cat-converters on those cars ALOT. They can reproduce the same problem you are describing without any cat-codes(i.e. cat inefficent etc.). Crusing at speed, moderate to fast accel builds back pressure, clogged cat does not allow correct amt. of back pressure out causing engine to choke. Not saying its the problem, but a very common one of those cars. Good luck bro! If you dont figure it out, PM me and I can get ahold of my buddies from the shop I was at...They are all BMW mechs and work on the full range from classic to showroom floor models.
Originally Posted by
BSeriesTurbo
I'm thinkin I've seen some of you post in the eye candy, and that hopefully you might frequent this section...
I work at a German repair shop and am seeing an unusual problem on a 2001 BMW 325i.
We have had the IM off to replace the oil seperator and related hoses, as well as repaired a few other vacuum leaks. The MAF has been replaced due to it being faulty as well.
When driving the car cruising at steady state the car is fine, but try to accelerate at all and it feels as though the E-throttle is opening and closing. It has good power when it is "open", but it will cycle as though you are flooring and letting off flooring and letting off...
No codes in the computer other than p0174 and p0171(lean codes both banks..). I've smoked the entire intake tract and all is well, no leaks present. Good vaccum (~23-25").
Stumped, any input would be greatly appreciated!